FprEN 4474
(Main)Aerospace series - Aluminium pigmented organic coatings - Coating methods
Aerospace series - Aluminium pigmented organic coatings - Coating methods
This document specifies the application method and quality assurance for aluminium pigmented coatings as per EN 4473 which may be applied to fasteners or other parts in titanium, titanium alloys, nickel or cobalt based alloys and corrosion resisting steels.
Luft- und Raumfahrt - Aluminiumpigmentierte organische Beschichtungen - Beschichtungsverfahren
Série aérospatiale - Revêtements alumino-organiques - Méthodes d’application
Le présent document spécifie la méthode d'application et l’assurance qualité pour les revêtements alumino‐organiques selon l’EN 4473 qui peuvent être appliqués sur les éléments de fixation ou autres pièces en titane, en alliages de titane, en alliages base nickel ou cobalt et en aciers résistant à la corrosion.
Aeronavtika - Organski premazi, pigmentirani z aluminijem - Premazne metode
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 4474:2023
01-maj-2023
Aeronavtika - Organski premazi, pigmentirani z aluminijem - Premazne metode
Aerospace series - Aluminium pigmented organic coatings - Coating methods
Luft- und Raumfahrt - Aluminiumpigmentierte organische Beschichtungen -
Beschichtungsverfahren
Série aérospatiale - Revêtements alumino-organiques - Méthodes d’application
Ta slovenski standard je istoveten z: prEN 4474
ICS:
49.025.20 Aluminij Aluminium
49.040 Prevleke in z njimi povezani Coatings and related
postopki, ki se uporabljajo v processes used in aerospace
letalski in vesoljski industriji industry
oSIST prEN 4474:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 4474:2023
oSIST prEN 4474:2023
DRAFT
EUROPEAN STANDARD
prEN 4474
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2023
ICS 49.040 Will supersede EN 4474:2016
English Version
Aerospace series - Aluminium pigmented organic coatings
- Coating methods
Série aérospatiale - Revêtements alumino-organiques - Luft- und Raumfahrt - Aluminiumpigmentierte
Méthodes d'application organische Beschichtungen - Beschichtungsverfahren
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 4474:2023 E
worldwide for CEN national Members.
oSIST prEN 4474:2023
prEN 4474:2023 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Equipment . 5
4.1 For application by dipping . 5
4.2 For application by spraying . 5
4.3 For curing. 5
5 Surface preparation . 5
6 Coating application . 5
6.1 General. 5
6.2 Application by dipping . 6
6.3 Application by spraying . 6
6.4 Other application methods . 6
7 Coating removal . 7
8 Quality assurance . 7
8.1 Fastener lot release requirements . 7
8.2 Process validation . 7
Annex A (normative) Quality assurance tests and sampling . 8
Annex B (informative) Standard evolution form . 10
Bibliography . 11
oSIST prEN 4474:2023
prEN 4474:2023 (E)
European foreword
This document (prEN 4474:2023) has been prepared by the Aerospace and Defence Industries
Association of Europe — Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 4474:2016.
The main changes compared to the previous edition are as follows:
— Subclause 8.1: removed anodization per ISO 8080;
— Subclause 9.1 a): “within 24 h after surface preparation” replaced by “if possible within 24 h after
surface preparation”;
— Subclause 9.1 b): removed requirements for humidity and temperature;
— Subclause 12.3: added 5 µm to 20 µm on internally threaded fasteners.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
oSIST prEN 4474:2023
prEN 4474:2023 (E)
1 Scope
This document defines the application method and quality assurance for aluminium pigmented coatings
as per EN 4473 which may be applied to fasteners or other parts in titanium, titanium alloys, nickel or
cobalt based alloys and corrosion resisting steels.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN ISO 2409, Paints and varnishes - Cross-cut test (ISO 2409)
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
NASM 1312-12, Fastener Test Methods, Method 12, Thickness of Metallic Coatings
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
production lot
parts subjected to the same aluminium pigmented coating application at the same time under the same
conditions
3.2
pre-production parts
parts representing future production parts
3.3
scratch
gouged out or scoring of the coating or base material
3.4
sampling plan
plan according to which one or more samples are taken in order to obtain information and to reach a
decision, if possible
3.5
Acceptable Quality Limit
AQL
maximum percent defective (or the maximum number of defects per hundred units) that, for purposes of
sampling inspection, can be considered satisfactory as a process average
Note 1 to entry: Variant: quality level which in a sampling plan corresponds to a specified but relatively high
probability of acceptance.
oSIST prEN 4474:2023
prEN 4474:2023 (E)
3.6
functional surfaces
surfaces in contact with mating structure and/or threaded portion such as:
— pins, bolts, lockbolts, screws, blind fasteners: under head bearing surface, shank, lead-in radius and
thread surface if applicable;
— nuts, threaded collars: bearing surfaces, thread surface;
— spherical washers: bearing surfaces;
— swaged collars: all surfaces
4 Equipment
4.1 For application by dipping
For application by dipping, a container with a lid, stirring device and temperature control shall be used.
The equipment shall be capable of applying the specified thickness, for example by controlling the speed
of immersion and removal and
...
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